Foldable zero-gravity seat

Abstract

A foldable zero-gravity seat, comprising a seat cushion framework, wherein the seat cushion framework comprises a seat cushion frame assembly, with the front end of the seat cushion frame assembly being hinged to upper front links, lower front links and seat cushion mounting brackets in sequence, and the rear end of the seat cushion frame assembly being hinged to rear links and the seat cushion mounting brackets in sequence; angle driving devices are provided at two hinge joints to drive the seat to switch between a normal position, a zero-gravity position and a folded position; in the normal position, the rear links are tilted backwards, and the lower front links are tilted; in the zero-gravity position, the rear and front ends of the seat cushion framework are higher than those of the seat cushion framework in the normal position; and during the process of switching to the folded position, the lower front links are driven to rotate, the rear links are driven to tilt forward simultaneously, and the upper front links are driven to rotate relative to the lower front links. On the basis of a five-link structure, the seat of the present application enables a more flexible rotation range of the seat cushion framework, thereby realizing zero-gravity position adjustment, forward folding of a seat cushion and height adjustment of the rear end of the seat cushion, and preventing the problem of a backrest abutting against the waist in the zero-gravity position.

Description

Foldable zero-pressure seat Cross-reference to related applications

[0001] This application claims the benefit of Chinese Utility Model Patent Application No. 202422189425.3, filed September 6, 2024, and Chinese Utility Model Patent Application No. 202520051177.8, filed January 9, 2025, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure belongs to the field of automobile seats, and specifically relates to a foldable zero-pressure seat. BACKGROUND

[0003] In order to alleviate the discomfort of long sitting, zero-pressure seats have been introduced on the market to meet the comfort needs of passengers, wherein a series of motion mechanisms are required to be provided to realize the height adjustment and multi-angle inclination of the seat cushion in order to meet the height adjustment of the seat.

[0004] For example, the Chinese patent document with the authorization announcement number CN219306336U discloses a height adjustment mechanism of a seat, which is used in a four-link seat structure. The height adjustment mechanism includes a seat cushion and an electric screw rod mechanism. The seat cushion is hinged on a seat cushion support through a front link and a rear link. The height adjustment mechanism realizes the height adjustment function by a push rod motor cooperating with the rear link, and the other end of the push rod motor being connected with an upper support of a slide rail. The front link can realize zero-pressure adjustment by being driven by an angle adjuster motor. However, the specific setting of the backrest and the working mode setting of the corresponding seat are not disclosed. Generally, the angle formed by the folding of the seat and the backrest is large, and the folding function cannot be realized.

[0005] The Chinese patent document with the authorization announcement number CN219544549U discloses a five-link adjustable seat, which includes a slide rail, a rear link, a wall plate, an outer front link and an inner front link. The bottom ends of the rear link and the inner front link are respectively pivoted to the slide rail, and the top ends of the rear link and the outer front link are respectively pivoted to the wall plate. The adjustable seat further includes a gear motor for driving the rear link through a rack. The gear motor is installed on the slide rail. The angle rotation function is realized by the cooperation of the gear motor and the rack and the hinging of the rack and the link. The front link of the adjustable seat can realize zero-pressure adjustment by being driven by an angle adjuster motor while realizing the height adjustment function of the seat. In addition, the specific setting of the backrest and the working mode setting of the corresponding seat are not disclosed. Generally, the angle formed by the folding of the seat and the backrest is large, and the folding function cannot be realized.

[0006] The Chinese patent document with the authorization announcement number CN217396316U discloses a foldable and reclining seat framework. The seat is lifted by a push rod motor cooperating with a rear connecting rod at one end and fixed with a front connecting rod at the other end. However, on the one hand, the front connecting rod and the rear connecting rod are linked, and the zero pressure function cannot be realized. On the other hand, the backrest is connected with the upper support of the slide rail, but since the folding is realized by arranging the backrest rotation point high, in order to realize the folding of the backrest, it will cause the backrest to seriously top the waist when lying down, reducing the comfort.

[0007] In summary, the current seat cannot perfectly realize the folding function and the zero pressure function, which will either cause a large folding angle or cause the backrest to seriously top the waist when lying down.

[0008] The purpose of the present disclosure is to provide a foldable and zero pressure seat, so that the three functions of zero gravity position adjustment, seat cushion folding forward, and seat cushion rear end height adjustment can be realized, and the backrest is prevented from topping the waist when in zero gravity.

[0009] In order to achieve the above-mentioned purpose, the present disclosure provides a foldable and zero pressure seat, which comprises a seat cushion framework and an adjustable backrest framework arranged separately from the seat cushion framework. The seat cushion framework comprises a seat cushion frame assembly, a seat cushion mounting bracket, an upper front connecting rod, a lower front connecting rod, and a rear connecting rod. The front end of the seat cushion frame assembly is hingedly connected with the upper front connecting rod, the lower front connecting rod, and the seat cushion mounting bracket in sequence. The rear end of the seat cushion frame assembly is hingedly connected with one end of the rear connecting rod, and the other end of the rear connecting rod is hingedly connected with the seat cushion mounting bracket, so as to form a plurality of hinged nodes. The plurality of hinged nodes comprises a first hinged node and a second hinged node. Angle driving devices are arranged at the first hinged node and the second hinged node, so as to drive the seat to switch between a normal posture, a zero pressure posture, and a folding posture. In the normal posture, the rear connecting rod is inclined backward, and the lower front connecting rod is inclined. In the zero pressure posture, the angles of the rear connecting rod and the lower front connecting rod are such that the rear end and the front end of the seat cushion frame assembly are higher than the rear end and the front end of the seat cushion frame assembly in the normal posture. In the process of switching from the normal posture and the zero pressure posture to the folding posture, the angle driving device drives the lower front connecting rod to rotate relative to the seat cushion mounting bracket, the angle driving device drives the rear connecting rod to incline forward, and the seat cushion frame assembly drives the upper front connecting rod to rotate relative to the lower front connecting rod.

[0010] According to the above technical concept, the present disclosure can further include any one or more of the following optional embodiments.

[0011] In some optional embodiments, the angle driving devices are respectively used to drive the first hinged node and the second hinged node. The motor of the angle driving device for driving the first hinged node directly or indirectly adjusts the angle of the lower front connecting rod, and the motor of the angle driving device for driving the second hinged node directly or indirectly adjusts the angle of the rear connecting rod.

[0012] In some alternative embodiments, the first articulation joint is the articulation joint between the seat cushion mounting bracket and the lower front link (correspondingly, the two relatively rotatable mechanisms articulated on both sides of the first articulation joint are the seat cushion mounting bracket and the lower front link), the articulation joint between the lower front link and the upper front link (correspondingly, the two relatively rotatable mechanisms articulated on both sides of the first articulation joint are the lower front link and the upper front link), or the articulation joint between the seat cushion frame assembly and the upper front link (correspondingly, the two relatively rotatable mechanisms articulated on both sides of the first articulation joint are the seat cushion frame assembly and the upper front link); and the second articulation joint is the articulation joint between the seat cushion mounting bracket and the rear link (correspondingly, the two relatively rotatable mechanisms articulated on both sides of the second articulation joint are the seat cushion mounting bracket and the rear link) or the articulation joint between the seat cushion frame assembly and the rear link (correspondingly, the two relatively rotatable mechanisms articulated on both sides of the second articulation joint are the seat cushion frame assembly and the rear link).

[0013] In some alternative embodiments, the angle driving device for driving the first articulation joint comprises one of:

[0014] a1) an angle adjuster provided at the first articulation joint, in which case the motor of the angle driving device can indirectly adjust the angle of the lower front link;

[0015] a2) a stepped bolt provided at the first articulation joint and a direct-connection motor for driving the stepped bolt to rotate, the stepped bolt and the direct-connection motor being fixed with respect to the two relatively rotatable mechanisms articulated on both sides of the first articulation joint, respectively, in which case the motor of the angle driving device can directly adjust the angle of the lower front link;

[0016] a3) a rack and pinion motor, one of the two relatively rotatable mechanisms articulated on both sides of the first articulation joint is provided with a rack articulation joint spaced apart from the first articulation joint and articulated with one end of the rack, and the other is fixedly mounted with the pinion motor, the pinion on the output shaft of the pinion motor being engaged with the teeth on the rack, in which case the motor of the angle driving device can indirectly adjust the angle of the lower front link;

[0017] a4) a push rod motor, one of the two relatively rotatable mechanisms articulated on both sides of the first articulation joint is fixedly mounted with the fixed end of the push rod motor, and the other is provided with a push rod motor articulation joint spaced apart from the first articulation joint and articulated with the movable end of the push rod motor, in which case the motor of the angle driving device can directly adjust the angle of the lower front link.

[0018] In some alternative embodiments, when the angle driving device for driving the first articulation joint comprises a rack and pinion motor and the first articulation joint is the articulation joint between the seat pan mounting bracket and the lower front link, the rack articulation joint is provided on one of the seat pan mounting bracket and the lower front link and the rack and pinion motor is provided on the other of the seat pan mounting bracket and the lower front link.

[0019] In some alternative embodiments, the angle driving device for driving the second articulation joint comprises one of:

[0020] b1) an angle adjuster provided at the second articulation joint, in which case the motor of the angle driving device can indirectly adjust the angle of the rear link;

[0021] b2) a stepped bolt provided at the second articulation joint and a direct motor driving the rotation of the stepped bolt, the stepped bolt and the direct motor being fixed with respect to the two opposite rotatable mechanisms articulated on two sides of the second articulation joint, in which case the motor of the angle driving device can directly adjust the angle of the rear link;

[0022] b3) a rack and pinion motor, one of the two opposite rotatable mechanisms articulated on two sides of the second articulation joint is provided with a rack articulation joint articulated with one end of the rack and spaced apart from the second articulation joint, and the other is fixedly provided with the rack and pinion motor, the gear on the output shaft of the rack and pinion motor being engaged with the teeth on the rack, in which case the motor of the angle driving device can indirectly adjust the angle of the rear link;

[0023] b4) a push rod motor, one of the two opposite rotatable mechanisms articulated on two sides of the second articulation joint is fixedly provided with the fixed end of the push rod motor, and the other is provided with a push rod motor articulation joint articulated with the movable end of the push rod motor and spaced apart from the second articulation joint, in which case the motor of the angle driving device can directly adjust the angle of the rear link.

[0024] In some alternative embodiments, when the angle driving device for driving the second articulation joint comprises a rack and pinion motor and the second articulation joint is the articulation joint between the seat pan mounting bracket and the rear link, the rack articulation joint is provided on one of the seat pan mounting bracket and the rear link and the rack and pinion motor is provided on the other of the seat pan mounting bracket and the rear link.

[0025] In some alternative embodiments, for the angle driving device employing an angle adjuster, it further comprises a synchronization rod inserted into the shaft center of the angle adjuster and an angle adjuster motor, the driving shaft of the angle adjuster motor being used to drive the corresponding synchronization rod to rotate, thereby driving the shaft center of the angle adjuster to rotate.

[0026] In some alternative embodiments, the inner side of the driving shaft of the angle adjuster motor and the outer side of the synchronization rod are provided with teeth that mesh with each other, and the driving shaft of the angle adjuster motor drives the synchronization rod to rotate through the meshing between the driving shaft of the angle adjuster motor and the synchronization rod.

[0027] In some alternative embodiments, for the angle driving device for driving the first hinged joint and employing a push rod motor, the push rod motor hinged joint is below its corresponding first hinged joint, or the push rod motor hinged joint is hinged to the push rod motor through a section of hinged rod, so that the main shaft of the push rod motor is below the first hinged joint corresponding to the push rod motor hinged joint; or the push rod motor hinged joint is above its corresponding first hinged joint, or the push rod motor hinged joint is hinged to the push rod motor through a section of hinged rod, so that the main shaft of the push rod motor is above the first hinged joint corresponding to the push rod motor hinged joint.

[0028] In some alternative embodiments, for the angle driving device for driving the second hinged joint and employing a push rod motor, the push rod motor hinged joint is below its corresponding second hinged joint, or the push rod motor hinged joint is hinged to the push rod motor through a section of hinged rod, so that the main shaft of the push rod motor is below the second hinged joint corresponding to the push rod motor hinged joint; thereby, the seat cushion frame assembly is lifted by the pushing of the push rod motor; or the push rod motor hinged joint is above its corresponding second hinged joint, or the push rod motor hinged joint is hinged to the push rod motor through a section of hinged rod, so that the main shaft of the push rod motor is above the second hinged joint corresponding to the push rod motor hinged joint; thereby, the seat cushion frame assembly is lowered by the pushing of the push rod motor.

[0029] In some alternative embodiments, the seat cushion frame includes two lower front connecting rods arranged on both sides of the seat cushion frame, and when the two opposite rotatable mechanisms hinged on both sides of the first hinged joint are the seat cushion mounting bracket and the lower front connecting rod respectively, a first lower front connecting rod cross pipe is connected between the two lower front connecting rods, the first lower front connecting rod cross pipe is arranged at the push rod motor hinged joint and is provided with a push rod motor bracket connected to the movable end of the push rod motor, so that the push rod motor is hinged to the lower front connecting rod at the push rod motor hinged joint through the first lower front connecting rod cross pipe.

[0030] In some alternative embodiments, during the switching from the normal posture to the zero pressure posture, the angle driving device drives the rear connecting rod to rotate relative to the seat cushion mounting bracket, so that the rear end of the seat cushion frame assembly moves forward and upward relative to the lower end of the adjustable backrest frame.

[0031] In some alternative embodiments, during the switching from the normal posture and the zero pressure posture to the folding posture, the angle driving device drives the rear connecting rod to rotate relative to the seat cushion mounting bracket, so that the rear end of the seat cushion frame assembly moves forward and downward relative to the lower end of the adjustable backrest frame.

[0032] In some optional embodiments, in the regular posture, the adjustable backrest framework is at a first backrest angle of backward inclination; in the zero-gravity posture, the adjustable backrest framework is at a second backrest angle of backward inclination and the inclination angle is greater than the first backrest angle; in the folding posture, the adjustable backrest framework is at a third backrest angle of forward inclination.

[0033] In some optional embodiments, the seat comprises a support structure, the seat cushion mounting bracket is fixed on the support structure, and the adjustable backrest framework is hinged to the support structure at the lower end thereof.

[0034] In some optional embodiments, the foldable zero-gravity seat further comprises a safety belt, the lower fixing point and the buckle mounting point of the safety belt are both located on the two sides of the seat cushion mounting bracket, and the upper fixing point of the safety belt is located on the side of the adjustable backrest framework.

[0035] The foldable zero-gravity seat of the present disclosure improves the driving mode of the angle driving device on the basis of the five-link structure, so that the rotation range of the seat cushion framework is more flexible, so that the zero-gravity position adjustment, the seat cushion forward folding, and the seat cushion rear end height adjustment three functions can be realized, while preventing the backrest top waist problem in the zero-gravity position, and further realizing the zero-gravity posture, the folding posture, the regular posture and other postures in cooperation with the backrest. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a whole structure diagram of the foldable zero-gravity seat of the present disclosure in the regular state in some embodiments.

[0037] Figure 2 is a frame position schematic diagram of the foldable zero-gravity seat of the present disclosure in the regular state in some embodiments.

[0038] Figure 3 is a whole structure diagram of the foldable zero-gravity seat of the present disclosure in the zero-gravity state in some embodiments.

[0039] Figure 4 is a frame position schematic diagram of the foldable zero-gravity seat of the present disclosure in the zero-gravity state in some embodiments.

[0040] Figure 5 is a whole structure diagram of the foldable zero-gravity seat of the present disclosure in the folding state in some embodiments.

[0041] Figure 6 is a frame position schematic diagram of the foldable zero-gravity seat of the present disclosure in the folding state in some embodiments.

[0042] Figures 7-9 are frame position schematic diagrams of the foldable zero-gravity seat of the present disclosure in the regular state, the zero-gravity state and the folding state respectively in other embodiments.

[0043] FIGS. 10-12 are schematic diagrams of the mounting positions of the lap belt anchor and the buckle mounting point of the foldable zero-pressure seat of the present disclosure in the regular state, the zero-pressure state, and the folded state.

[0044] FIG. 13 is a schematic diagram of the moving manner of the lap belt anchor and the buckle of the foldable zero-pressure seat of the present disclosure when the state is changed.

[0045] FIG. 14 is a detailed structural diagram of the buckle mounting point of the foldable zero-pressure seat of the present disclosure.

[0046] FIG. 15 is a detailed structural diagram of the lap belt anchor of the foldable zero-pressure seat of the present disclosure.

[0047] FIG. 16 is an exploded view of the adjustable seat cushion framework of the foldable zero-pressure seat according to one embodiment of the present disclosure.

[0048] FIG. 17 is an exploded view of the left piece and the connecting rod of the seat cushion mounting bracket of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in FIG. 16.

[0049] FIG. 18 is an exploded view of the right piece and the connecting rod of the seat cushion mounting bracket of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in FIG. 16.

[0050] FIG. 19 is a whole structural diagram of the seat cushion frame assembly of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in FIG. 16.

[0051] FIG. 20 is an exploded view of the seat cushion frame assembly of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in FIG. 16.

[0052] FIG. 21 is an exploded view of the adjustable seat cushion framework of the foldable zero-pressure seat according to another embodiment of the present disclosure.

[0053] FIG. 22 is an exploded view of the left piece and the connecting rod of the seat cushion mounting bracket of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in FIG. 21.

[0054] FIG. 23 is an exploded view of the right piece and the connecting rod of the seat cushion mounting bracket of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in FIG. 21.

[0055] FIG. 24 is an exploded view of the left piece and the direct connecting motor mounting structure of the seat cushion mounting bracket of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in FIG. 21.

[0056] FIG. 25 is a whole structural diagram of the seat cushion frame assembly of the adjustable seat cushion framework of the foldable zero-pressure seat as shown in FIG. 21.

[0057] Figure 26 is an exploded view of the seat cushion frame assembly of the adjustable seat cushion chassis of the foldable zero-pressure seat as shown in Figure 21.

[0058] Figure 27 is a side view and partial enlarged view of the adjustable seat cushion chassis of the foldable zero-pressure seat according to another embodiment of the present disclosure.

[0059] Figure 28 is a side view structural diagram of the adjustable seat cushion chassis of the foldable zero-pressure seat in a regular posture according to another embodiment of the present disclosure.

[0060] Figure 29 is a side view structural diagram of the adjustable seat cushion chassis of the foldable zero-pressure seat in a folded posture as shown in Figure 28.

[0061] Figure 30 is a partial enlarged view of the part where the gear motor and the rack of the foldable zero-pressure seat as shown in Figure 28, which shows the matching principle of the gear motor and the rack.

[0062] Figure 31 is a schematic diagram of the gear rack drive assembly of the foldable zero-pressure seat according to another embodiment of the present disclosure.

[0063] Figure 32 is a schematic diagram of the gear rack drive assembly of the foldable zero-pressure seat according to another embodiment of the present disclosure.

[0064] Figure 33 is a side view structural diagram of the adjustable seat cushion chassis of the foldable zero-pressure seat in a regular posture according to another embodiment of the present disclosure.

[0065] Figure 34 is a partial enlarged view of Figure 33.

[0066] Figure 35 is an exploded view of the adjustable seat cushion chassis of the foldable zero-pressure seat according to another embodiment of the present disclosure.

[0067] Figure 36 is an exploded view of the gear rack drive assembly of the adjustable seat cushion chassis of the foldable zero-pressure seat as shown in Figure 35.

[0068] Figure 37 is a side view of the adjustable seat cushion chassis of the foldable zero-pressure seat as shown in Figure 35, which shows the push rod motor.

[0069] Figure 38 is a schematic diagram of the gear rack drive assembly and the push rod motor of the adjustable seat cushion chassis of the foldable zero-pressure seat as shown in Figure 35.

[0070] Figure 39 is a side view of the adjustable seat cushion chassis of the foldable zero-pressure seat according to another embodiment of the present disclosure, which shows another arrangement of the push rod motor.

[0071] Figure 40 is an exploded view of the upper front connecting rod and its accessories of the adjustable seat cushion chassis of the foldable zero-pressure seat as shown in Figure 35.

[0072] Figure 41 is an exploded view of the lower front link of the adjustable seat pan frame of the foldable zero-pressure seat shown in Figure 35 and its fittings.

[0073] Figure 42 is an exploded view of the seat pan frame assembly of the adjustable seat pan frame of the foldable zero-pressure seat shown in Figure 35.

[0074] Figure 43 is an exploded view of the adjustable seat pan frame of the foldable zero-pressure seat according to another embodiment of the present disclosure.

[0075] Figure 44 is a schematic diagram of the rack and pinion drive assembly and push rod motor of the adjustable seat pan frame of the foldable zero-pressure seat shown in Figure 43.

[0076] Figure 45 is an exploded view of the rack and pinion drive assembly of the adjustable seat pan frame of the foldable zero-pressure seat as shown in Figure 43.

[0077] Figure 46 is a side view of the adjustable seat pan frame of the foldable zero-pressure seat as shown in Figure 43 showing the push rod motor.

[0078] Figure 47 is a side view of the adjustable seat pan frame of the foldable zero-pressure seat according to another embodiment of the present disclosure showing another arrangement of the push rod motor.

[0079] Figure 48 is an exploded view of the upper front link of the adjustable seat pan frame of the foldable zero-pressure seat shown in Figure 43 and its fittings.

[0080] Figure 49 is an exploded view of the lower front link of the adjustable seat pan frame of the foldable zero-pressure seat shown in Figure 43 and its fittings.

[0081] Figure 50 is an exploded view of the seat pan frame assembly of the adjustable seat pan frame of the foldable zero-pressure seat shown in Figure 43.

[0082] Figure 51 is an exploded view of the adjustable seat pan frame of the foldable zero-pressure seat according to another embodiment of the present disclosure.

[0083] Figure 52 is a schematic diagram of the rack and pinion drive assembly and push rod motor of the adjustable seat pan frame of the foldable zero-pressure seat shown in Figure 51.

[0084] Figure 53 is a schematic diagram of the mounting of the recliner on the right piece of the seat pan mounting bracket of the adjustable seat pan frame of the foldable zero-pressure seat as shown in Figure 51.

[0085] Figure 54 is a schematic diagram of the mounting of the recliner on the left piece of the seat pan mounting bracket of the adjustable seat pan frame of the foldable zero-pressure seat as shown in Figure 51.

[0086] FIG. 55 is a side view of the adjustable seat pan frame of the foldable zero- pressure seat shown in FIG. 51, showing a push rod motor.

[0087] FIG. 56 is a side view of the adjustable seat pan frame of the foldable zero- pressure seat according to another embodiment of the present application, showing another arrangement of the push rod motor.

[0088] FIG. 57 is an exploded view of the upper front link and its fittings of the adjustable seat pan frame of the foldable zero-pressure seat shown in FIG. 51.

[0089] FIG. 58 is an exploded view of the lower front link and its fittings of the adjustable seat pan frame of the foldable zero-pressure seat shown in FIG. 51.

[0090] FIG. 59 is an exploded view of the seat pan frame assembly of the adjustable seat pan frame of the foldable zero-pressure seat shown in FIG. 51. DETAILED DESCRIPTION

[0091] As shown in FIGS. 1-6, the foldable zero-pressure seat of the present disclosure includes a seat pan frame 10 and an adjustable backrest frame 20 arranged separately from the seat pan frame 10. The seat pan frame 10 and the adjustable backrest frame 20 are mounted separately on a sliding frame of a slide rail assembly 30, so as to realize the separate arrangement and synchronous forward and backward movement of the seat pan frame 10 and the adjustable backrest frame 20. The slide rail assembly 30 can be regarded as a support structure for supporting the seat pan frame 10 and the adjustable backrest frame 20. It can be envisaged that the support structure is not limited to the slide rail assembly, but can also be other suitable support structures capable of supporting the seat pan frame and the adjustable backrest frame.

[0092] The seat pan frame 10 includes a seat pan frame assembly 11 and a seat pan mounting bracket 12. The front end of the seat pan frame assembly 11 is hingedly connected with an upper front link 13, a lower front link 14, and the seat pan mounting bracket 12 in sequence, so as to form a hinged joint, that is, the front end of the seat pan frame assembly 11 is hingedly connected with one end of the upper front link 13, the other end of the upper front link 13 is hingedly connected with one end of the lower front link 14, and the other end of the lower front link 14 is hingedly connected with the seat pan mounting bracket 12. The rear end of the seat pan frame assembly 11 is hingedly connected with one end of a rear link 15, and the other end of the rear link 15 is hingedly connected with the seat pan mounting bracket 12, so as to form a hinged joint. Thus, the whole of the seat pan frame 10 forms a five-link adjustable frame.

[0093] The seat pan mounting bracket 12 is fixed, and in the present embodiment, the seat pan mounting bracket 12 is fixed on the sliding frame of the slide rail assembly 30, so as to realize the forward and backward movement of the whole of the seat pan frame 10.

[0094] The seat cushion framework 10 further comprises two angle driving devices, which can be respectively arranged at any two hinged joints of the seat cushion framework 10. Thus, by adopting the angle driving devices at any two joints, the adjustment of the height and the front and back position of the seat cushion is achieved by the common driving of the two angle driving devices, so as to drive the entire seat cushion framework 10 to reach any required position state. In the embodiment, the two angle driving devices are respectively arranged at the hinged joint between the rear link 15 and the seat cushion mounting bracket 12 of the seat cushion framework 10, and the hinged joint between the lower front link 14 and the seat cushion mounting bracket 12.

[0095] In addition, the adjustable backrest framework 20 is hinged at the lower end with the sliding frame of the slide rail assembly 30, and the angle of the adjustable backrest framework 20 is separately driven by a backrest angle driving device arranged at the hinged joint between the adjustable backrest framework 20 and the slide rail assembly 30, so as to realize the independent driving of the backrest and the seat cushion.

[0096] In the present disclosure, the seat cushion framework 10 and the adjustable backrest framework 20 enable the seat to be switched between at least the following three states:

[0097] 1) Regular posture: In some embodiments, the regular posture of the seat is shown in FIGS. 1 and 2. In the regular posture, the rear link 15 of the seat cushion framework 10 is in a rear link first angle of backward inclination, and the lower front link 14 is in a front link first angle of forward inclination. The rear link 15 in the rear link first angle enables the rear end of the seat cushion framework assembly 11 to be at a first height and below the hinged joint between the adjustable backrest framework 20 and the slide rail assembly 30. Meanwhile, the adjustable backrest framework 20 is in a backrest first angle of backward inclination. Thus, the entire seat is in the regular posture.

[0098] 2) Zero pressure posture: In some embodiments, the zero pressure posture of the seat is shown in FIGS. 3 and 4. In the process of adjusting the seat from the regular posture to the zero pressure posture, the adjustable backrest framework 20 is adjusted backward from the backrest first angle to a backrest second angle; the rear link 15 is turned forward from the rear link first angle to a rear link second angle, so that the rear end of the seat cushion framework 10 moves forward and upward (more specifically, the rear end of the seat cushion framework assembly 11 moves forward and upward relative to the lower end of the adjustable backrest framework 20), thereby enabling the rear end of the seat cushion to be flush with the lower part of the backrest to solve the top waist problem; the lower front link 14 is turned backward to a front link second angle, so that the front end of the seat cushion framework 10 is adjusted upward. Thus, the zero pressure posture of the seat is achieved.

[0099] That is, in the zero-pressure posture of the seat, the rear link 15 is at the rear link second angle, and the lower front link 14 is at the front link second angle, so that the rear end and the front end of the seat cushion framework 10 are higher than those in the normal posture. The adjustable backrest framework 20 is at the backrest second angle which is larger than the backrest first angle and is in contact with the rear end of the seat cushion framework 10.

[0100] 3) Folding posture: In some embodiments, the folding posture of the seat is shown in FIGS. 5 and 6. In the process of adjusting the seat from the normal posture to the folding posture, the adjustable backrest framework 20 is adjusted forward from the backrest first angle to the backrest third angle; the rear link 15 is rotated forward from the rear link first angle to the rear link third angle, so that the rear end of the seat cushion framework 10 moves forward and downward (more specifically, the rear end of the seat cushion framework assembly 11 moves forward and downward relative to the lower end of the adjustable backrest framework 20); the lower front link 14 is rotated forward to the front link third angle, so that the front end of the seat cushion framework 10 moves forward and downward, so that the downward folding position is lower. Thus, the folding posture of the seat is achieved.

[0101] In addition, the folding posture of the seat can also be adjusted directly from the zero-pressure position to the folding posture, and accordingly, the adjustable backrest framework 20 is adjusted forward from the backrest second angle to the forwardly inclined backrest third angle; the rear link 15 is directly rotated forward from the rear link second angle to the rear link third angle, so that the rear end of the seat cushion framework 10 moves forward and downward; the lower front link 14 is directly rotated forward to the front link third angle, so that the front end of the seat cushion framework 10 moves forward and downward, so that the downward folding position is lower. Thus, the folding posture of the seat is achieved.

[0102] That is, in the process of switching the seat from the normal posture and the zero-pressure posture to the folding posture, the driving device drives the lower front link 14 to rotate relative to the seat cushion mounting bracket 12, while the driving device drives the rear link to incline forward, and through the seat cushion framework assembly 11, the driving device drives the upper front link 13 to rotate relative to the lower front link 14.

[0103] Preferably, in the folding posture of the seat, the rear link 15 and the lower front link 14 are respectively at the forwardly inclined and nearly horizontal rear link third angle and the front link third angle. The adjustable backrest framework 20 is at the forwardly inclined and nearly horizontal backrest third angle. In some embodiments, the included angles of the backrest third angle, the rear link third angle, and the horizontal plane are each less than 35 degrees.

[0104] In some embodiments, the back of the seat is provided with a luggage cover plate; when the seat is in the folding posture, the height of the rear end of the seat backrest is flush with the height of the luggage cover plate of the car, so that the luggage can form a bed panel together with the surrounding seats in the folding posture.

[0105] Compared with the existing seat cushion rear end height adjusting mechanism, the foldable zero-gravity seat of the present disclosure improves the driving mode of the angle driving device based on the five-link structure (specifically, a combination of an angle adjuster motor and other motors), so that the rotation range of the seat cushion framework is more flexible, and the functions of zero-gravity position adjustment, seat cushion folding forward, and seat cushion rear end height adjustment can all be achieved, while preventing the problem of the backrest top waist in the zero-gravity position, thereby enabling the zero-gravity posture, folding posture, conventional posture, and other postures to be achieved in cooperation with the backrest. In addition, compared with the prior art in which the adjustable backrest framework is arranged on the seat cushion framework, the separate arrangement of the adjustable backrest framework and the seat cushion framework allows the postures of the adjustable backrest framework and the seat cushion framework to be adjusted more flexibly. On the one hand, this allows the rear end of the seat cushion frame assembly to move forward and upward relative to the lower end of the adjustable backrest framework during the switching of the seat from the conventional posture to the zero-gravity posture, so that the lower end of the backrest and the rear end of the seat cushion are flat / naturally transitioned in the zero-gravity posture, thereby avoiding the discomfort of the waist caused by the backrest top waist; on the other hand, this allows the rear end of the seat cushion frame assembly to move forward and downward relative to the lower end of the adjustable backrest framework during the switching of the seat from the conventional posture or the zero-gravity posture to the folding posture, so as to reserve space for the folded backrest (in particular, the relatively protruding waist rest part of the backrest), thereby allowing the backrest to be close to horizontal after folding, so that the seat occupies less space after folding.

[0106] In other embodiments, as shown in FIGS. 7-9, the rear link 15 is in a rearwardly inclined first rear link angle in the conventional state, in a second rear link angle in the zero-gravity posture, and in a forwardly inclined third rear link angle in the folding posture; however, the angles of the lower front link 14 in different states are different, and the functions of the foldable zero-gravity seat of the present disclosure can also be achieved. Among them, the lower front link 14 is in a rearwardly inclined first front link angle in the conventional state, in a second front link angle in the zero-gravity posture, and in a rearwardly inclined third front link angle in the folding posture, so as to achieve the functions of the foldable zero-gravity seat of the present disclosure.

[0107] As shown in FIGS. 10-13, the lower fixing point 41 and the buckle mounting point 42 of the safety belt are both located on the two sides of the seat cushion mounting bracket 12, specifically at the rear position of the seat cushion mounting bracket 12; and the upper fixing point of the safety belt is the same as the prior art, located at the shoulder of the adjustable backrest framework 20. Thus, the safety belt can follow the body posture change in the conventional posture and the zero-gravity posture. The seat cushion framework 10 and the adjustable backrest framework 20 of the foldable zero-gravity seat of the present disclosure are independently arranged, and the flexibility of adjustment is stronger, so that a more optimal restraining effect can be obtained in the zero-gravity state to ensure more stable safety performance.

[0108] The structure of the buckle mounting point 42 and the lower fixing point 41 of the safety belt is shown in FIGS. 14 and 15.

[0109] First embodiment: both front and rear linkages use angle adjuster and motor driven foldable zero-pressure seat

[0110] As shown in FIGS. 16-20, a foldable zero-pressure seat according to the first embodiment of the present disclosure is provided, in which the angle driving device of the seat cushion framework 110 and the adjustable backrest framework 120 are both synchronous rods driven by an angle adjuster motor and angle adjusters driven by the synchronous rods to drive the linkages to rotate. According to the first embodiment of the present disclosure, the basic structure of the seat cushion framework 110 and the adjustable backrest framework 120 is exactly the same as the basic structure of the seat cushion framework 10 and the adjustable backrest framework 20 described above.

[0111] As shown in FIG. 16, according to the first embodiment of the present disclosure, the seat cushion framework 110 includes a seat cushion frame assembly 111 and seat cushion mounting brackets 1121, 1122. The front end of the seat cushion frame assembly 111 is hingedly connected to the upper front linkage 113, the lower front linkage 114, and the seat cushion mounting bracket in turn, that is, the front end of the seat cushion frame assembly 111 is hingedly connected to one end of the upper front linkage 113, the other end of the upper front linkage 113 is hingedly connected to one end of the lower front linkage 114, and the other end of the lower front linkage 114 is hingedly connected to the seat cushion mounting bracket. The rear end of the seat cushion frame assembly 111 is hingedly connected to one end of the rear linkage 115, and the other end of the rear linkage 115 is hingedly connected to the seat cushion mounting brackets 1121, 1122.

[0112] Since the seat cushion mounting brackets 1121, 1122 include a right piece 1121 and a left piece 1122 of the seat cushion mounting bracket, the number of the upper front linkage 113, the lower front linkage 114, and the rear linkage 115 can be 2.

[0113] The upper front linkage 113 and the lower front linkage 114, and the upper front linkage 113 and the seat cushion frame assembly 111 are hingedly connected by linkage assembly bolts 1131.

[0114] As shown in FIGS. 17 and 18, the angle driving device includes an angle adjuster 116 provided at the hinged joint between the seat cushion mounting brackets 1121, 1122 and the lower front linkage 114, and provided at the hinged joint between the seat cushion mounting brackets 1121, 1122 and the rear linkage 115, which is used to directly adjust the angle of the lower front linkage 114 and the rear linkage 115. The shaft 1163 of the angle adjuster 116 is connected to the seat cushion mounting bracket, and the outer part (i.e., the tooth plate part) of the angle adjuster is connected to the lower front linkage 114 and the rear linkage 115 to rotate synchronously with the lower front linkage 114 and the rear linkage 115. At least one of the lower front linkage 114 and the rear linkage 115 is provided with an angle adjuster stop point 1161, and the seat cushion mounting bracket is provided with an angle adjuster stop portion 1162 matched therewith to limit the adjustable angle range.

[0115] In other embodiments, the angle driving device can be arranged at the other two hinged nodes, and correspondingly, the angle driving device comprises an angle adjuster 116 arranged at the other two hinged nodes, which is used to directly or indirectly adjust the angle of the lower front connecting rod 114 and the rear connecting rod 115.

[0116] Referring to FIGS. 16-18, the angle driving device further comprises two synchronous rods inserted into the shaft center 1163 of the angle adjuster 116, which are a front synchronous rod 117 corresponding to the lower front connecting rod 114 and a rear synchronous rod 118 corresponding to the rear connecting rod 115.

[0117] The two ends of the front synchronous rod 117 and the rear synchronous rod 118 are provided with synchronous rod clamps 1171, which are used to fix the two ends of the front synchronous rod 117 and the rear synchronous rod 118 to the shaft center 1163 of the angle adjuster 116.

[0118] The lower front connecting rod 114 is fixedly provided with an angle adjuster motor 119, and the driving shaft of the angle adjuster motor 119 is used to drive the front synchronous rod 117 to rotate, thereby driving the shaft center 1163 of the angle adjuster 116 to rotate, so that the seat cushion mounting bracket 1121, 1122 and the lower front connecting rod 114 rotate relatively. Similarly, the rear connecting rod 115 is fixedly provided with an angle adjuster motor 119, and the driving shaft of the angle adjuster motor 119 is used to drive the rear synchronous rod 118 to rotate, thereby driving the shaft center 1163 of the angle adjuster 116 to rotate, so that the seat cushion mounting bracket 1121, 1122 and the rear synchronous rod 118 rotate relatively.

[0119] The driving shaft of the angle adjuster motor 119 can drive the synchronous rod to rotate in the form of teeth arranged on the inner side of the driving shaft and the outer side of the synchronous rod, which are engaged with each other, so that the driving shaft of the angle adjuster motor 119 drives the synchronous rod to rotate through the engagement between the driving shaft and the synchronous rod.

[0120] Therefore, the angle driving device comprises the synchronous rods 117, 118 driven to rotate by the angle adjuster motor 119 and the angle adjuster 116 driven to rotate by the synchronous rods 117, 118 to drive the connecting rod to rotate, and the angle adjuster motor drives the synchronous rod and then drives the angle adjuster, so that the angle rotation of the lower front connecting rod and the rear connecting rod is realized, the rotation range of the seat cushion framework is more flexible, and the functions of zero gravity position adjustment, seat cushion folding forward, and seat cushion rear end height adjustment can be realized, while preventing the problem of the backrest top waist at the zero gravity position.

[0121] The angle adjuster motor 119 is installed on the lower front link 114 or the rear link 115 by a motor mounting bolt 1191 and a motor mounting bracket 1192. In this embodiment, the angle adjuster motor 119 is an RTA driving motor (angle adjuster adjustment mechanism) that has the functions of outputting concentric and eccentric, is light in weight and small in size, and has metal teeth and thus is excellent in durability.

[0122] Figs. 19 and 20 show the detailed structure of the seat cushion frame assembly 111. As shown in Figs. 19 and 20, the seat cushion frame assembly 111 includes seat frame side plates 1111 on the left and right sides, a cross pipe 1112 connected between the rear ends of the two seat frame side plates 1111, a diving tube 1113 connected between the front ends of the two seat frame side plates 1111, a diving tube bracket 1114 sleeved on the diving tube 1113, and a seat cushion half-pot 1116 provided on the diving tube bracket 1114.

[0123] The top end of the rear link 115 is matched with the cross pipe 1112 to realize the hinging of the rear link with the rear end of the seat cushion frame assembly.

[0124] A bushing 1115 is provided between the cross pipe 1112 and the seat frame side plate 1111 and between the diving tube 1113 and the seat frame side plate 1111.

[0125] Second embodiment: foldable zero-pressure seat with the rear link directly driven by a straight connection motor and the lower front link driven by an angle adjuster and a motor

[0126] Figs. 21-26 show a foldable zero-pressure seat according to the second embodiment of the present disclosure, in which the angle driving device for driving the rear link includes a stepped bolt fixedly connected with the rear link and a straight connection motor connected with the stepped bolt to drive the rotation of the stepped bolt, and the angle driving device for driving the lower front link includes a synchronous rod driven to rotate by an angle adjuster motor and an angle adjuster driven to rotate by the synchronous rod to drive the rotation of the lower front link.

[0127] As shown in Fig. 21, according to the second embodiment of the present disclosure, the seat cushion framework 210 includes a seat cushion frame assembly 211 and seat cushion mounting brackets 2121, 2122. The front end of the seat cushion frame assembly 211 is hinged with the upper front link 213, the lower front link 214, and the seat cushion mounting brackets in sequence, that is, the front end of the seat cushion frame assembly 211 is hinged with one end of the upper front link 213, the other end of the upper front link 213 is hinged with one end of the lower front link 214, and the other end of the lower front link 214 is hinged with the seat cushion mounting brackets. The rear end of the seat cushion frame assembly 211 is hinged with one end of the rear link 215, and the other end of the rear link 215 is hinged with the seat cushion mounting brackets.

[0128] Since the seat cushion mounting bracket 2121, 2122 includes a right piece 2121 and a left piece 2122 of the seat cushion mounting bracket, the number of the upper front link 213, the lower front link 214 and the rear link 215 can be 2. The upper front link 213 and the lower front link 214, the upper front link 213 and the seat cushion frame assembly 211 are hinged through a link assembly bolt 2131.

[0129] As shown in FIGS. 21-23, the angle driving device includes an angle adjuster 216 provided at a hinged joint between the seat cushion mounting bracket 2121, 2122 and the lower front link 214, the angle adjuster 216 being used to adjust the angle of the lower front link 214. The shaft center 2163 of the angle adjuster 216 is connected to the seat cushion mounting bracket, and the outer part (i.e. the tooth plate part) of the angle adjuster is connected to the lower front link 214 to rotate synchronously with the lower front link 214. At least one of the lower front link 214 is provided with an angle adjuster stop point 2161, and the seat cushion mounting bracket is provided with an angle adjuster stop part 2162 matched therewith, so as to limit the adjustable angle range of the angle of the rear link 215.

[0130] In other embodiments, the angle adjuster stop point 2161 and the angle adjuster stop part 2162 matched with each other can be provided at other hinged joints with the angle adjuster when the angle adjuster is in other hinged positions.

[0131] The foldable zero-pressure seat further includes a front synchronous rod 217 inserted into the shaft center 2163 of the angle adjuster 216.

[0132] Wherein, the two ends of the front synchronous rod 217 are provided with synchronous rod clamping springs 2171, which are used to fix the two ends of the front synchronous rod 217 to the shaft center 2163 of the angle adjuster 216.

[0133] Wherein, the lower front link 214 is fixedly provided with an angle adjuster motor 219, the driving shaft of the angle adjuster motor 219 being used to drive the front synchronous rod 217 to rotate, thereby driving the shaft center 2163 of the angle adjuster 216 to rotate, so that the relative rotation between the seat cushion mounting bracket 2121, 2122 and the lower front link 214 occurs.

[0134] Wherein, the driving shaft of the angle adjuster motor 219 can drive the synchronous rod 217 to rotate in the form that the inner side of the driving shaft and the outer side of the synchronous rod 217 are provided with teeth meshing with each other, and the driving shaft of the angle adjuster motor 219 drives the synchronous rod to rotate through the meshing between the driving shaft and the synchronous rod.

[0135] Thus, the angle driving device comprises a synchronous rod 217 driven to rotate by the angle adjuster motor 219 and an angle adjuster 216 driven to rotate by the synchronous rod 217, and the angle rotation of the front lower link and the rear link is achieved by driving the synchronous rod by the angle adjuster motor and then driving the angle adjuster, so that the rotation range of the seat cushion framework is more flexible, thereby realizing the three functions of zero-gravity position adjustment, seat cushion forward folding, and seat cushion rear end height adjustment, while preventing the backrest from toppling at the zero-gravity position.

[0136] The angle adjuster motor 219 is installed on the front lower link 214 through a motor mounting bolt 2191 and a motor mounting bracket 2192. In this embodiment, the angle adjuster motor 219 is an RTA drive motor.

[0137] Referring to FIG. 21, in this embodiment, a first nut 2152 and a first bolt 2153 are arranged at the hinged joint between the right part 2122 of the seat cushion mounting bracket and the rear link 215, and the first nut 2152 and the first bolt 2153 are used to hinge the right part 2121 of the seat cushion mounting bracket and the rear link 215 together. Specifically, the first bolt 2153 is sleeved with a bushing and is hingedly fixed to the seat cushion mounting bracket together with the first nut 2152.

[0138] As shown in FIGS. 21 and 24, a second gasket 2154, a second nut 2155, and a second bolt 2156 are arranged at the hinged joint between the left part 2122 of the seat cushion mounting bracket and the rear link 215. The second gasket 2154 is used to space the seat cushion mounting bracket and the rear link 215 apart, and the second nut 2155 and the second bolt 2156 are used to hinge the left part 2122 of the seat cushion mounting bracket and the rear link 215 together. The second bolt 2156 is sleeved with a bushing 201 and is hingedly fixed to the seat cushion mounting bracket together with the second nut 2155. The second bolt 2156 is a stepped bolt, which has a square shaft section 2157, a first circular shaft section 2158, and a second circular shaft section 2159. The second circular shaft section 2159 is welded and fixed to the rear link 215, so that the two rotate synchronously. The first circular shaft section 2158 is inserted into the mounting hole of the seat cushion mounting bracket, so that the second bolt 2156 can rotate relative to the seat cushion mounting bracket. The square shaft section 2157 is connected to the driving part of a direct connection motor 218 to drive the second bolt 2156 to rotate, thereby driving the rear link 215 to rotate. The driving part is provided with a mounting hole matched with the square shaft section of the second bolt 2156. The direct connection motor 218 is fixed to the seat cushion mounting bracket through a motor mounting bolt 2181. In this embodiment, the direct connection motor 218 is a PHA motor (electric height adjustment mechanism), which is currently applied to a framework system with or without a booster spring, has excellent strength and self-locking performance, and can realize seamless switching between manual and electric.

[0139] In addition, the connecting rod assembly bolts 2131 are each provided with a bushing 201, and the rear connecting rod 215 is provided with a bushing 201 at the matching structure of the seat cushion frame assembly 211, so that the assembly of the entire seat cushion framework 210 is more stable.

[0140] Figs. 25 and 26 show the specific structure of the seat cushion frame assembly 211. As shown in Figs. 25 and 26, the specific structure of the seat cushion frame assembly 211 according to the second embodiment of the present disclosure is exactly the same as that of the seat cushion frame assembly of the first embodiment of the present disclosure, including the seat frame side plates 2111 on the left and right sides, the cross pipe 2112 connected between the rear ends of the two seat frame side plates 2111, the anti-submarine pipe 2113 connected between the front ends of the two seat frame side plates 2111, the anti-submarine pipe bracket 2114 sleeved on the anti-submarine pipe 2113, and the seat cushion half-pot 2116 provided on the anti-submarine pipe bracket 2114.

[0141] The top end of the rear connecting rod 215 matches the cross pipe 2112 to realize the hinging of the rear connecting rod with the rear end of the seat cushion frame assembly. Different from the first embodiment of the present disclosure, due to the presence of the direct connection motor 218, the rear connecting rod 215 driven by the direct connection motor 218 is no longer located at the two ends of the cross pipe 2112 as in the first embodiment of the present disclosure, but is closer to the middle part of the cross pipe 2112.

[0142] Thus, the angle driving device for driving the rear connecting rod includes a stepped bolt fixedly connected with the rear connecting rod and a direct connection motor connected with the stepped bolt to drive the rotation of the stepped bolt, and the angle driving device for driving the lower front connecting rod includes a synchronous rod driven to rotate by the angle adjuster motor and an angle adjuster driven to rotate by the synchronous rod. The angle rotation of the rear connecting rod and the lower front connecting rod is realized by the direct driving mode of the direct connection motor and the mode of the angle adjuster motor driving the synchronous rod to drive the angle adjuster to drive the connecting rod and the direct driving mode of the motor to drive the connecting rod, so that the rotation range of the seat cushion framework is more flexible, thereby realizing the three functions of zero gravity position adjustment, seat cushion forward folding, and seat cushion rear end height adjustment, while preventing the problem of the backrest top waist at the zero gravity position.

[0143] In other embodiments, as shown in Fig. 27, the angle driving devices corresponding to the rear connecting rod and the lower front connecting rod can be interchanged, so that the angle driving device for driving the lower front connecting rod includes a stepped bolt fixedly connected with the rear connecting rod and a direct connection motor connected with the stepped bolt to drive the rotation of the stepped bolt, and the angle driving device for driving the rear connecting rod includes a synchronous rod driven to rotate by the angle adjuster motor and an angle adjuster driven to rotate by the synchronous rod.

[0144] In other embodiments, the step bolt can be fixedly connected with any one of the mechanisms that the hinged joint is hinged to, for example, the step bolt can also be fixedly connected with the seat cushion mounting frame to rotate with it, and the rotation of the continuous rod is driven by the rotation of the motor itself. The hinged joint provided with the step bolt and the direct-connection motor can be any one of the hinged joints. The angle driving device comprises an angle adjuster arranged at one hinged joint, and a step bolt and a direct-connection motor for driving the rotation of the step bolt arranged at another hinged joint, and the step bolt and the direct-connection motor are fixedly arranged on two different mechanisms hinged by the hinged joint.

[0145] Third embodiment: foldable zero-pressure seat with rear continuous rod driven by gear motor and rack and lower front continuous rod driven by angle adjuster and motor

[0146] According to the third embodiment of the present disclosure, the structure of the adjustable backrest framework is exactly the same as that described above, the structure of the seat cushion framework is basically the same as that of the seat cushion framework 110 of the first embodiment of the present disclosure, and the only difference is that the driving mode of the rear continuous rod is changed from being driven by an angle adjuster and a motor to being driven by a gear motor and a rack.

[0147] As shown in FIGS. 28-30, according to the third embodiment of the present disclosure, the rear end of the seat cushion frame assembly 311 is hinged to one end of the rear continuous rod 315, and the other end of the rear continuous rod 315 is hinged to the seat cushion mounting bracket 312 at the hinged joint A.

[0148] The angle driving device for driving the rear continuous rod 315 comprises a rack 319 and a gear motor 318 fixedly mounted on the rear continuous rod 315, one end of the rack 319 is hinged to the rack hinged joint B on the seat frame mounting bracket 312, and the teeth thereon are engaged with the gear on the output shaft 3181 of the gear motor 318.

[0149] Therefore, the output shaft 3181 of the gear motor 318 is located on the rear continuous rod 315 and can rotate synchronously with the rear continuous rod 315 around the hinged joint A, so the relative distance between the output shaft 3181 and the hinged joint A is fixed. The hinged joint A and the rack hinged joint B are both located on the seat frame mounting bracket 312, and the relative position and distance between them are fixed. By driving the rack 319 by the gear motor 318, the relative distance between the output shaft 3181 and the rack hinged joint B can be changed, and the output shaft 3181 and the rear continuous rod 315 are driven to rotate synchronously to realize the normal posture, the zero-pressure posture and the folding posture of the foldable zero-pressure seat described above.

[0150] In the embodiment, the rack articulation node B between the rack 319 and the seat frame mounting bracket 312 is located in front of the articulation node A between the rear link 315 and the seat frame mounting bracket 312, and the gear motor 318 is installed on the rear side of the rear link 315, so that the rotatable range of the rear link 315 meets the requirements, avoiding the interference between the gear motor 318 and the seat frame mounting bracket 312 when the foldable zero-pressure seat is in the regular posture and the folded posture.

[0151] The rack 319 is articulated with a part of the seat frame mounting bracket 312 at the rack articulation node B, and the seat frame mounting bracket 312 is further articulated with a motor gear mounting bracket 320, the motor gear mounting bracket 320 is provided with a rack pressing block 321, the motor gear mounting bracket 320 is inserted with the gear of the output shaft 3181 and the rack 319, and the rack pressing block 321 is used to press the gear of the output shaft 3181 and the rack 319 together to realize the meshing of the two. Thus, the angle driving device for driving the rear link 315 rotates the rear link 315 around the articulation node A by directly driving the articulation node A (i.e. driving the rear link 315 and the seat frame mounting bracket 312 articulated by the articulation node A), and then directly or indirectly adjusts the angle of the rear link 315.

[0152] In other embodiments, as shown in FIG. 31, the installation positions of the rack and the gear motor can be interchanged, that is, the rack articulation node is arranged on the rear link and articulated with one end of the rack and spaced from the articulation node A, and the gear motor is fixedly installed on the seat cushion mounting bracket 312 and meshes with the teeth on the rack through the gear on the output shaft of the gear motor. Thus, the angle driving device for driving the rear link 315 rotates the rear link 315 around the articulation node A by directly driving the articulation node A, and then directly or indirectly adjusts the angle of the rear link 315.

[0153] In the embodiment, the angle driving device for directly or indirectly adjusting the angle of the rear link 315 is realized by directly driving the rear link 315 to rotate around the articulation node A, that is, by directly driving the mechanism on both sides of the articulation node A. However, in other embodiments, the angle driving device for adjusting the angle of the rear link 315 is not limited to being realized by driving the articulation node A.

[0154] For example, in another embodiment, as shown in FIG. 32, other structural settings are the same as the third embodiment of the present disclosure, and the only difference is that the angle driving device can achieve the angle adjustment of the rear link 315 by driving the hinged node C, which is the hinged node between the rear link 315 and the seat cushion frame assembly 311. Specifically, the rear link 315 is provided with a rack hinged node hinged to one end of the rack and spaced apart from the hinged node C, and the gear motor is fixedly installed on the seat cushion frame assembly 311 and meshes with the teeth on the rack through the gear on the output shaft of the gear motor.

[0155] Furthermore, in other embodiments in which the angle driving device for adjusting the angle of the rear link 315 is achieved by driving the hinged node C, the fixed installation positions of the rack hinged node and the gear motor can be interchanged, as long as the rack hinged node is provided on one of the rear link 315 and the seat cushion frame assembly 311, and the installation position of the gear motor is located on the other of the rear link 315 and the seat cushion frame assembly 311.

[0156] Fourth embodiment: foldable zero-pressure seat with rear link driven by angle adjuster and motor and lower front link driven by gear motor and rack

[0157] According to the fourth embodiment of the present disclosure, the structure of the adjustable backrest framework is exactly the same as that described above, the structure of the seat cushion framework is basically the same as that of the seat cushion framework 110 of the first embodiment of the present disclosure, and the only difference is that the driving mode of the lower front link is changed from being driven by an angle adjuster and a motor to being driven by a motor and a rack.

[0158] As shown in FIGS. 33 and 34, according to the fourth embodiment of the present disclosure, the front end of the seat cushion frame assembly 411 is hinged to one end of the upper front link 413, the other end of the upper front link 413 is hinged to one end of the lower front link 414, and the other end of the lower front link 414 is hinged to the seat cushion mounting bracket 412 at the hinged node A'.

[0159] The angle driving device for driving the lower front link 414 includes a rack 419 and a gear motor 418 fixedly installed on the seat cushion mounting bracket 412, one end of the rack 419 is hinged to a rack hinged node B' on the lower front link 414, and the teeth thereon mesh with the gear on the output shaft 4181 of the gear motor 418. In this embodiment, the gear motor 418 is a PHA motor.

[0160] Thus, the rack articulation node B' of the rack 419 is located on the lower front link 414, and the rack articulation node B' can rotate synchronously with the lower front link 414 around the articulation node A', so the relative distance between the rack articulation node B' and the articulation node A' is fixed. The articulation node A' and the output shaft 4181 of the gear motor 418 are both located on the seat frame mounting bracket 412, and the relative position and distance between them are fixed. By driving the rack 419 through the gear motor 418, the relative distance between the output shaft 4181 and the rack articulation node B' can be changed, thereby driving the rack articulation node B' and the lower front link 414 to rotate synchronously, so as to realize the normal posture, zero-pressure posture and folding posture of the foldable and zero-pressure seat as described above.

[0161] In the present embodiment, the lower front link 414 is deformed to extend downward relative to the articulation node A', so that in the normal posture, the rack articulation node B' between the rack 419 and the lower front link 414 is located behind the articulation node A' between the lower front link 414 and the seat frame mounting bracket 412, thereby meeting the requirements of the rotation range of the lower front link 414, avoiding interference between the gear motor 418 and the seat frame mounting bracket 412 when the foldable and zero-pressure seat is in the normal posture and the folding posture.

[0162] The seat frame mounting bracket 412 is also provided with a fixed motor gear mounting bracket 420, which is provided with a rack pressing block. The motor gear mounting bracket 420 is used for inserting the gear of the output shaft 4181 and the rack 419, and the rack pressing block is used for pressing the gear of the output shaft 4181 and the rack 419 together to realize the meshing of the two.

[0163] Fifth embodiment: foldable and zero-pressure seat with rear link driven by gear motor and rack and lower front link driven by lead screw motor

[0164] According to the fifth embodiment of the present disclosure, the structure of the adjustable backrest framework is exactly the same as that described above, and the structure of the seat cushion framework is basically the same as that of the seat cushion framework 110 of the first embodiment of the present disclosure, and the only difference is that the driving mode of the rear link is changed to be driven by a gear motor and a rack, and the driving mode of the front link is changed to be driven by a lead screw motor.

[0165] As shown in FIG. 35, according to the fifth embodiment of the present disclosure, the seat cushion framework 510 comprises a seat cushion frame assembly 511 and seat cushion mounting brackets 5121, 5122. The front end of the seat cushion frame assembly 511 is hingedly connected with the upper front link 513, the lower front link 514 and the seat cushion mounting brackets in sequence, that is, the front end of the seat cushion frame assembly 511 is hingedly connected with one end of the upper front link 513, the other end of the upper front link 513 is hingedly connected with one end of the lower front link 514, and the other end of the lower front link 514 is hingedly connected with the seat cushion mounting brackets at a first hinged joint. The rear end of the seat cushion frame assembly 511 is hingedly connected with one end of the rear link 515, and the other end of the rear link 515 is hingedly connected with the seat cushion mounting brackets at a second hinged joint.

[0166] Since the seat cushion mounting brackets 5121, 5122 comprise a right piece 5121 and a left piece 5122 of the seat cushion mounting brackets, the number of the upper front link 513, the lower front link 514 and the rear link 515 can be 2. The hinged connection between the lower front link 514 and the seat cushion mounting brackets 5121, 5122 and the hinged connection between the rear link 515 and the seat cushion mounting brackets 5121, 5122 are achieved by the link assembly bolt 5131.

[0167] That is, as shown in FIG. 38, the first hinged joint is the hinged joint between the seat cushion mounting brackets and the upper front link 513, and the second hinged joint is the hinged joint between the seat cushion mounting brackets and the rear link 515.

[0168] As shown in FIG. 35, the angular driving device for driving the second hinged joint to rotate the rear link 515 is a rack and pinion driving assembly 516, which is connected with the seat cushion mounting brackets and the rear link 515 (i.e. two opposite rotatable mechanisms on both sides of the second hinged joint) by the motor mounting bolt 5161 and the rack mounting bolt 5162, respectively.

[0169] As shown in FIG. 36 and FIG. 38, the rack and pinion driving assembly 516 comprises a rack 5163 and a pinion motor 5164 fixedly mounted on the right piece 5121 of the seat cushion mounting brackets, one end of the rack 5163 is hingedly connected with a fixed rack hinged joint 5166 on the rear link 515, the rack hinged joint 5166 is spaced apart from the second hinged joint, and the teeth on the rack 5163 are engaged with the pinion on the output shaft of the pinion motor 5164. The pinion motor 5164 is fixed on the right piece 5121 of the seat cushion mounting brackets by the motor mounting bolt 5161 and the motor mounting bracket 5165.

[0170] In other embodiments, the mounting positions of the rack articulation node and the gear motor can be interchanged, as long as one of the seat cushion mounting bracket and the rear link is provided with the rack articulation node articulated with one end of the rack and spaced apart from the second articulation node, and the other is fixedly mounted with the gear motor and engaged with the teeth of the rack through the gear on the output shaft of the gear motor.

[0171] Referring to FIG. 35, the angle driving device for driving the first articulation node and thus rotating the lower front link 514 is a push rod motor 517. The rear end of the push rod motor 517 is a fixed end and is fixed to the left piece 5122 of the seat cushion mounting bracket through a push rod motor rear mounting screw 5171. The front end of the push rod motor 517 is a movable end and is articulated with the push rod motor articulation point on the lower front link 514 through a push rod motor front mounting screw 5172. The push rod motor articulation point is spaced apart from the first articulation node. Therefore, when the push rod motor 517 works, it drives the push rod motor articulation point to rotate around the first articulation node, thus driving the lower front link 514 to rotate relative to the seat cushion mounting bracket.

[0172] In the present embodiment, the push rod motor 517 is a lead screw motor.

[0173] As shown in FIGS. 37 and 38, in the present embodiment, the push rod motor articulation point 5141 on the lower front link 514 is kept below the first articulation node 5142 between the seat cushion mounting bracket and the lower front link 514. Therefore, the push rod motor 517 is arranged horizontally. Moving the movable end of the push rod motor 517 forward drives the lower front link 514 to rotate upward, i.e., the lower front link 514 rotates counterclockwise in FIG. 37, thus driving the front end of the seat cushion frame assembly 511 to rise. Moving the movable end of the push rod motor 517 backward drives the lower front link 514 to rotate downward, thus driving the front end of the seat cushion frame assembly 511 to fall.

[0174] As shown in FIG. 39, in another embodiment, other structural arrangements are exactly the same as those of the fifth embodiment of the present application. The only difference is that the push rod motor articulation point 5141 on the lower front link 514 is kept above the first articulation node 5142 between the seat cushion mounting bracket and the lower front link 514. Therefore, the push rod motor 517 is arranged obliquely. Moving the movable end of the push rod motor 517 forward drives the lower front link 514 to rotate downward, i.e., the lower front link 514 rotates clockwise in FIG. 39, thus driving the front end of the seat cushion frame assembly 511 to fall. Moving the movable end of the push rod motor 517 backward drives the lower front link 514 to rotate upward, thus driving the front end of the seat cushion frame assembly 511 to rise.

[0175] As shown in FIG. 40, in the present embodiment, the number of the upper front link 513 is two, and the two upper front links 513 are connected together at the hinged joint between the upper front link 513 and the seat cushion frame assembly 511 through an upper front link cross pipe 5132, so as to further ensure the synchronous rotation of the two upper front links 513. A bushing 501 is arranged between the upper front link 513 and the upper front link cross pipe 5132, and a cross pipe rubber sleeve 5133 is arranged at the two ends of the upper front link cross pipe 5132, so that the assembly is more stable. In addition, at least one stopper support 5134 can be arranged on at least one upper front link 513, so that the upper front link 513 is limited when it rotates to the maximum angle.

[0176] As shown in FIG. 41, in the present embodiment, the number of the lower front link 514 is two, which are the right and left pieces of the lower front link. The two lower front links 514 are each provided with a gasket 5143 at the first hinged joint between the lower front link 514 and the seat cushion mounting bracket, and the two lower front links 514 are connected together at the hinged joint between the lower front link 514 and the upper front link 513 through a lower front link cross pipe 5144, so as to further ensure the synchronous rotation of the two upper front links 513. A bushing 501 is arranged between the lower front link 514 and the lower front link cross pipe 5144, and a cross pipe rubber sleeve 5145 is arranged at at least one end of the upper front link cross pipe 5132, so that the assembly is more stable. The right and left pieces of the lower front link are different in that the left piece of the lower front link is further provided with a push rod motor hinged joint 5141 below the first hinged joint 5142, so that the left piece of the lower front link forms an inverted V-shaped structure with the push rod motor hinged joint 5141 as the top point, and the push rod motor hinged joint 5141 of the lower front link 514 and the lower front link cross pipe 5144 are further connected through a lower front link reinforcing support 5146, so as to further strengthen the strength of the left piece of the lower front link. In addition, the rod body of the cross rod 5144 of the lower front link is provided with a torsional spring fixing hole, so as to be fixedly connected with one end of a torsional spring 5147, and the other end of the torsional spring 5147 is connected with the upper front link 513, so as to provide a force to the lower front link 514 through the torsional spring 5147, which makes the lower front link 514 rotate in a direction that increases the included angle between the lower front link 514 and the upper front link 513.

[0177] FIG. 42 shows the specific structure of the seat cushion frame assembly 511. As shown in FIG. 42, the seat cushion frame assembly 511 includes seat frame side plates 5111 on the left and right sides, a seat cushion cross pipe 5112 connected between the rear ends of the two seat frame side plates 5111, a diving tube 5113 connected between the front ends of the two seat frame side plates 5111, a diving tube support 5114 sleeved on the diving tube 5113, and a seat cushion half basin 5116 arranged on the diving tube support 5114.

[0178] In addition, the connecting rod assembly bolts 5131 are each provided with a bushing 501, and the seat cushion cross tube 5112 and the seat frame side plate 5111 are provided with a bushing 501, so that the assembly of the entire seat cushion framework 510 is more stable. The top end of the rear connecting rod 515 is matched with the seat cushion cross tube 5112 to realize the articulation of the rear end of the rear connecting rod and the seat cushion frame assembly.

[0179] Thus, the angle driving device realizes the angular rotation of the lower front connecting rod and the rear connecting rod, so that the rotation range of the seat cushion framework is more flexible, thereby realizing the three functions of zero-gravity position adjustment, seat cushion forward folding, and seat cushion rear end height adjustment, while preventing the problem of the backrest top waist at the zero-gravity position.

[0180] Sixth embodiment: foldable zero-pressure seat with rear connecting rod driven by gear motor and rack and lower front connecting rod driven by lead screw motor

[0181] According to the sixth embodiment of the present disclosure, the structure of the adjustable backrest framework is exactly the same as that described above, the structure of the seat cushion framework is basically the same as that of the seat cushion framework 110 of the first embodiment of the present disclosure, and the only difference is that the driving mode of the rear connecting rod is changed to be driven by a gear motor and a rack, and the driving mode of the front connecting rod is changed to be driven by a lead screw motor.

[0182] As shown in FIG. 43, according to the sixth embodiment of the present disclosure, the seat cushion framework 610 includes a seat cushion frame assembly 611 and seat cushion mounting supports 6121, 6122. The front end of the seat cushion frame assembly 611 is articulated with a upper front connecting rod 613, a lower front connecting rod 614, and a seat cushion mounting support in turn, that is, the front end of the seat cushion frame assembly 611 is articulated with one end of the upper front connecting rod 613, the other end of the upper front connecting rod 613 is articulated with one end of the lower front connecting rod 614, and the other end of the lower front connecting rod 614 is articulated with the seat cushion mounting support at a first articulation node. The rear end of the seat cushion frame assembly 611 is articulated with one end of a rear connecting rod 615 at a second articulation node, and the other end of the rear connecting rod 615 is articulated with the seat cushion mounting support.

[0183] Since the seat cushion mounting supports 6121, 6122 include a right piece 6121 and a left piece 6122 of the seat cushion mounting support, the number of the upper front connecting rod 613, the lower front connecting rod 614, and the rear connecting rod 615 can be 2. The articulation between the upper front connecting rod 613 and the lower front connecting rod 614, between the lower front connecting rod 614 and the seat cushion mounting supports 6121, 6122, and between the rear connecting rod 615 and the seat cushion mounting supports 6121, 6122 is realized by connecting rod assembly bolts 6131.

[0184] That is, as shown in FIG. 44, the main difference between the sixth embodiment of the present disclosure and the fifth embodiment is that the first articulation joint is the articulation joint between the seat cushion mounting bracket and the lower front link 614, and the second articulation joint is the articulation joint between the seat cushion frame assembly 611 and the rear link 615.

[0185] As shown in FIGS. 43 and 45, the angular drive device for driving the second articulation joint and thus the rear link 615 to rotate is a rack and pinion drive assembly 616, which is connected to the seat cushion frame assembly 611 and the rear link 615 (i.e., the two opposite rotatable mechanisms articulated on both sides of the second articulation joint) by a motor mounting bolt 6161 and a rack mounting bolt 6162, respectively.

[0186] The rack and pinion drive assembly 616 includes a rack 6163 and a pinion motor 6164 fixedly mounted on the seat cushion frame assembly 611. One end of the rack 5163 is articulated on a fixed rack articulation joint 6166 on the rear link 615 by the rack mounting bolt 6162, which is spaced apart from the second articulation joint, and the teeth on the rack 6163 are engaged with the pinion on the output shaft of the pinion motor 6164. The pinion motor 6164 is fixed to the seat cushion frame assembly 611 by the motor mounting bolt 6161 and a motor mounting bracket 6165.

[0187] In other embodiments, the installation positions of the rack and pinion motor can be interchanged, i.e., one of the seat cushion frame assembly 611 and the rear link 615 is provided with a rack articulation joint articulated with one end of the rack and spaced apart from the second articulation joint, and the other is fixedly mounted with the pinion motor and engaged with the teeth on the rack through the pinion on the output shaft of the pinion motor.

[0188] Referring again to FIG. 43, the angular drive device for driving the first articulation joint and thus the lower front link 614 to rotate is a push rod motor 617, wherein the rear end of the push rod motor 617 is a fixed end and is fixed to the seat cushion mounting bracket by a push rod motor rear mounting screw 6171, and the front end of the push rod motor 617 is a movable end and is articulated with a push rod motor articulation joint on the lower front link 614 by a push rod motor front mounting screw 6172, which is spaced apart from the first articulation joint. Therefore, when the push rod motor 617 is working, it will drive the push rod motor articulation joint to rotate around the first articulation joint, thus driving the lower front link 614 to rotate relative to the seat cushion mounting bracket.

[0189] In this embodiment, the number of push rod motors 617 is 2. The push rod motor 617 is a lead screw motor.

[0190] As shown in FIGS. 44 and 46, in the present embodiment, the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept below the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the forward movement of the movable end of the push rod motor 617 will cause the lower front connecting rod 614 to rotate upward, i.e. the lower front connecting rod 614 rotates counterclockwise in FIG. 46, thereby causing the front end of the seat cushion frame assembly 611 to rise; while the backward movement of the movable end of the push rod motor 617 will cause the lower front connecting rod 614 to rotate downward, thereby causing the front end of the seat cushion frame assembly 611 to descend.

[0191] As shown in FIG. 47, in another embodiment, other structural arrangements are exactly the same as the sixth embodiment of the present disclosure, the only difference is that the push rod motor hinge point 6141 on the lower front connecting rod 614 is kept above the first hinge joint 6142 between the seat cushion mounting bracket and the lower front connecting rod 614, so that the push rod motor 617 is inclined to be arranged, and the forward movement of the movable end of the push rod motor 617 will cause the lower front connecting rod 614 to rotate downward, i.e. the lower front connecting rod 614 rotates clockwise in FIG. 47, thereby causing the front end of the seat cushion frame assembly 611 to descend; while the backward movement of the movable end of the push rod motor 617 will cause the lower front connecting rod 614 to rotate upward, thereby causing the front end of the seat cushion frame assembly 611 to rise.

[0192] As shown in FIG. 48, in the present embodiment, the number of the upper front connecting rods 613 is two, and the middle parts of the two upper front connecting rods 613 are connected together through the upper front connecting rod cross pipe 6132 to further ensure the synchronous rotation of the two upper front connecting rods 613. The upper front connecting rod 613 is provided with a bushing 601 at the hinge joint thereof with the seat cushion frame assembly 611, and is provided with a bushing 601 and a gasket 602 at the hinge joint thereof with the lower front connecting rod 614, so that the assembly is more stable.

[0193] As shown in FIG. 49, in the present embodiment, the number of the lower front connecting rods 614 is two, which are the left and right pieces of the lower front connecting rod. Among them, the two lower front connecting rods 614 are each provided with a bushing 601 and a gasket 602 at the first hinge joint between the seat cushion mounting bracket and the lower front connecting rod 614, and are provided with a bolt sleeve 603 at the hinge joint with the upper front connecting rod 613. The two lower front connecting rods 614 are connected together through the first lower front connecting rod cross pipe 6144 and the second lower front connecting rod cross pipe 6145; the second lower front connecting rod cross pipe 6145 is used to further ensure the synchronous rotation of the two lower front connecting rods 614; the first lower front connecting rod cross pipe 6144 is arranged at the push rod motor hinge point 6141 and is provided with a push rod motor bracket 6146 connected with the movable end of the push rod motor 617, so as to realize the hinge connection of the push rod motor 617 with the lower front connecting rod 614 at the push rod motor hinge point 6141 through the first lower front connecting rod cross pipe 6144.

[0194] Figure 50 shows the detailed structure of the seat cushion frame assembly 611. As shown in Figure 50, the seat cushion frame assembly 611 comprises seat frame side plates 6111 on the left and right sides, a seat cushion cross tube 6112 connected between the rear ends of the two seat frame side plates 6111, a snorkel tube 6113 connected between the front ends of the two seat frame side plates 6111, a snorkel tube bracket 6114 sleeved on the snorkel tube 6113, and a seat cushion half-pot 6116 provided on the snorkel tube bracket 6114.

[0195] In addition, the seat cushion frame assembly 611 is provided with a bushing 601 at the connecting rod assembly bolt 6131, and a bushing 601 is provided between the seat cushion cross tube 6112 and the seat frame side plate 6111, so that the assembly of the entire seat cushion skeleton 610 is more stable. The top end of the rear connecting rod 615 matches the cross tube 6112 to realize the articulation of the rear connecting rod and the rear end of the seat cushion frame assembly.

[0196] Thus, the angle driving device realizes the angular rotation of the lower front connecting rod and the rear connecting rod, making the rotation range of the seat cushion skeleton more flexible, so that the three functions of zero-gravity position adjustment, seat cushion forward folding, and seat cushion rear end height adjustment can be realized, while preventing the problem of the backrest top waist at the zero-gravity position.

[0197] Seventh embodiment: foldable zero-pressure seat with rear connecting rod driven by angle adjuster and motor and lower front connecting rod driven by lead screw motor

[0198] According to the seventh embodiment of the present disclosure, the structure of the adjustable backrest skeleton is exactly the same as that described above, the structure of the seat cushion skeleton is basically the same as that of the seat cushion skeleton 110 of the first embodiment of the present disclosure, the driving mode of the rear connecting rod includes driving the rear connecting rod by an angle adjuster and a motor, and the only difference is that the driving mode of the front connecting rod is changed to be driven by a lead screw motor.

[0199] As shown in Figure 51, according to the seventh embodiment of the present disclosure, the seat cushion skeleton 710 comprises a seat cushion frame assembly 711 and seat cushion mounting brackets 7121, 7122. The front end of the seat cushion frame assembly 711 is articulated with the upper front connecting rod 713, the lower front connecting rod 714, and the seat cushion mounting bracket in turn, that is, the front end of the seat cushion frame assembly 711 is articulated with one end of the upper front connecting rod 713, the other end of the upper front connecting rod 713 is articulated with one end of the lower front connecting rod 714, and the other end of the lower front connecting rod 714 is articulated with the seat cushion mounting bracket at a first articulation node. The rear end of the seat cushion frame assembly 711 is articulated with one end of the rear connecting rod 715, and the other end of the rear connecting rod 615 is articulated with the seat cushion mounting bracket at a second articulation node.

[0200] Since the seat cushion mounting bracket 7121, 7122 includes a right piece 7121 and a left piece 6122 of the seat cushion mounting bracket, the number of the upper front link 713, the lower front link 714 and the rear link 715 can be 2. The upper front link 713 and the lower front link 714, the lower front link 714 and the seat cushion mounting bracket 7121, 7122, and the rear link 715 and the seat cushion mounting bracket 7121, 7122 are hingedly connected by the link assembly bolt 7131.

[0201] That is, as shown in FIG. 52, in the seventh embodiment of the present disclosure, the first hinged joint is the hinged joint between the seat cushion mounting bracket and the lower front link 714, and the second hinged joint is the hinged joint between the seat cushion mounting bracket and the rear link 715. The mechanism hingedly connected on both sides of the first hinged joint is driven by a lead screw motor, and the mechanism hingedly connected on both sides of the second hinged joint is driven by an angle adjuster and a motor.

[0202] As shown in FIGS. 51, 53 and 54, the angle driving device includes an angle adjuster 7161 provided at the second hinged joint between the seat cushion mounting bracket 7121, 7122 and the rear link 715 to rotate the rear link 715, and the angle adjuster 7161 is used to directly adjust the angle of the rear link 715. The shaft center of the angle adjuster 7161 is connected to the seat cushion mounting bracket, and the outer part (i.e. the tooth plate part) of the angle adjuster is connected to the rear link 715 to rotate synchronously with the rear link 715. The rear link 715 is provided with an angle adjuster stop point, and the seat cushion mounting bracket is provided with an angle adjuster stop portion 7162 matched with the angle adjuster stop point to limit the adjustable angle range.

[0203] In other embodiments, the second hinged joint can be provided at other positions capable of directly or indirectly adjusting the angle of the rear link 715, for example, the second hinged joint can be the hinged joint between the rear link 715 and the seat cushion frame assembly 711.

[0204] The angle driving device further includes a synchronous rod 7163 inserted into the shaft center of the angle adjuster 7161.

[0205] The two ends of the synchronous rod 7163 are provided with synchronous rod clamping springs 7164, which are used to fix the two ends of the synchronous rod 7163 to the shaft center of the angle adjuster 7161.

[0206] The rear link 715 is fixedly provided with an angle adjuster motor 7166, and the driving shaft of the angle adjuster motor 7166 is used to drive the synchronous rod 7163 to rotate, thereby driving the shaft center of the angle adjuster 7161 to rotate, so that the seat cushion mounting bracket and the synchronous rod 7163 rotate relatively. The angle adjuster motor 7166 is fixed to one of the rear links 715 by an angle adjuster motor mounting bracket 7165 and a motor mounting bolt 7167.

[0207] The driving shaft of the angle adjuster motor 7166 can be arranged to drive the synchronous rod to rotate by arranging a plurality of teeth on the inner side of the driving shaft and the outer side of the synchronous rod, and the driving shaft of the angle adjuster motor 7166 drives the synchronous rod to rotate by engaging the teeth on the driving shaft and the synchronous rod.

[0208] Referring to FIG. 51, the angle driving device for driving the first hinge joint to rotate the lower front connecting rod 714 is a push rod motor 717. The rear end of the push rod motor 717 is fixed to the seat cushion mounting support by a push rod motor rear mounting screw 7171, and the front end of the push rod motor 717 is hingedly connected to a push rod motor hinge point on the lower front connecting rod 714 by a push rod motor front mounting screw 7172. The push rod motor hinge point is spaced apart from the first hinge joint. Therefore, when the push rod motor 717 is operated, the push rod motor hinge point rotates around the first hinge joint, thereby driving the lower front connecting rod 714 to rotate relative to the seat cushion mounting support.

[0209] In the embodiment, the number of the push rod motors 717 is two. The push rod motor 717 is a lead screw motor.

[0210] As shown in FIGS. 52 and 55, in the embodiment, the push rod motor hinge point 7141 on the lower front connecting rod 714 is indirectly hingedly connected to the push rod motor 717 by an additional hinge rod, so that the main shaft of the push rod motor 717 is kept below the first hinge joint 7142. Therefore, when the movable end of the push rod motor 717 moves forward, the lower front connecting rod 714 rotates upward, i.e., counterclockwise rotation in FIG. 55, thereby driving the front end of the seat cushion frame assembly 711 to rise. When the movable end of the push rod motor 717 moves backward, the lower front connecting rod 714 rotates downward, thereby driving the front end of the seat cushion frame assembly 711 to fall.

[0211] As shown in FIG. 56, in another embodiment, the other structures are the same as those of the seventh embodiment of the present application, and the only difference is that the push rod motor hinge point 7141 on the lower front connecting rod 714 is indirectly hingedly connected to the push rod motor 717 by an additional hinge rod, so that the main shaft of the push rod motor 717 is kept above the first hinge joint 7142. Therefore, when the movable end of the push rod motor 717 moves forward, the lower front connecting rod 714 rotates downward, i.e., clockwise rotation in FIG. 56, thereby driving the front end of the seat cushion frame assembly 711 to fall. When the movable end of the push rod motor 717 moves backward, the lower front connecting rod 714 rotates upward, thereby driving the front end of the seat cushion frame assembly 711 to rise.

[0212] As shown in FIG. 57, in the present embodiment, the number of the upper front connecting rods 713 is two, and the middle parts of the two upper front connecting rods 713 are connected together through the upper front connecting rod cross pipe 7132 to further ensure the synchronous rotation of the two upper front connecting rods 713. The upper front connecting rod 713 is provided with a bushing 701 at the hinged joint with the lower front connecting rod 714, so that the assembly is more stable.

[0213] As shown in FIG. 58, in the present embodiment, the number of the lower front connecting rods 714 is two, which are the left and right pieces of the lower front connecting rod. Among them, the two lower front connecting rods 714 are connected together through the first lower front connecting rod cross pipe 7144 and the second lower front connecting rod cross pipe 7145; the second lower front connecting rod cross pipe 7145 is used to further ensure the synchronous rotation of the two lower front connecting rods 714; the first lower front connecting rod cross pipe 7144 is arranged at the push rod motor hinged joint 7141 and is provided with a push rod motor support 7146 connected with the movable end of the push rod motor 717, so that the hinging of the push rod motor 717 and the lower front connecting rod 714 at the push rod motor hinged joint 7141 is realized through the first lower front connecting rod cross pipe 7144.

[0214] FIG. 59 shows the specific structure of the seat cushion frame assembly 711. As shown in FIG. 59, the seat cushion frame assembly 711 includes seat frame side plates 7111 on the left and right sides, a seat cushion cross pipe 7112 connected between the rear ends of the two seat frame side plates 7111, a diving tube 7113 connected between the front ends of the two seat frame side plates 7111, a diving tube support 7114 sleeved on the diving tube 7113, and a seat cushion half-pot 7116 arranged on the diving tube support 7114.

[0215] In addition, the seat cushion frame assembly 711 is provided with a bushing 701 at the connecting rod assembly bolt, and a bushing 701 is arranged between the seat cushion cross pipe 7112 and the seat frame side plate 7111, so that the assembly of the entire seat cushion framework 610 is more stable. The top end of the rear connecting rod 715 matches the cross pipe 7112 to realize the hinging of the rear connecting rod and the rear end of the seat cushion frame assembly.

[0216] Therefore, the angle driving device realizes the angular rotation of the lower front connecting rod and the rear connecting rod, so that the rotation range of the seat cushion framework is more flexible, thereby realizing the three functions of zero gravity position adjustment, seat cushion forward folding, and seat cushion rear end height adjustment, while preventing the problem of backrest top waist at the zero gravity position.

[0217] The above is only a preferred embodiment of the present disclosure, not to limit the scope of the present disclosure, and various changes can be made to the above-mentioned embodiments of the present disclosure. Any simple, equivalent changes and modifications made in accordance with the content of the claims and the specification of the present disclosure fall within the scope of the claims of the present disclosure. The present disclosure does not describe in detail.

Claims

1. A foldable zero-pressure seat, characterized by, The seat cushion framework comprises a seat cushion frame assembly, a seat cushion mounting bracket, an upper front connecting rod, a lower front connecting rod and a rear connecting rod, the front end of the seat cushion frame assembly is hingedly connected with the upper front connecting rod, the lower front connecting rod and the seat cushion mounting bracket in sequence, the rear end of the seat cushion frame assembly is hingedly connected with one end of the rear connecting rod, and the other end of the rear connecting rod is hingedly connected with the seat cushion mounting bracket, so as to form a plurality of hinged nodes. The plurality of hinged nodes comprises a first hinged node and a second hinged node, and an angle driving device is arranged at the first hinged node and the second hinged node to drive the seat to switch among a normal posture, a zero-pressure posture and a folding posture; in the normal posture, the rear connecting rod is inclined backward, and the lower front connecting rod is inclined; in the zero-pressure posture, the angles of the rear connecting rod and the lower front connecting rod are such that the rear end and the front end of the seat cushion frame assembly are higher than the rear end and the front end of the seat cushion frame assembly in the normal posture; in the process of switching from the normal posture and the zero-pressure posture to the folding posture, the angle driving device drives the lower front connecting rod to rotate relative to the seat cushion mounting bracket, the angle driving device drives the rear connecting rod to incline forward, and the angle driving device drives the upper front connecting rod to rotate relative to the lower front connecting rod through the seat cushion frame assembly. The angle driving device is used for driving the first hinged node and the second hinged node, respectively, the motor of the angle driving device used for driving the first hinged node directly or indirectly adjusts the angle of the lower front connecting rod, and the motor of the angle driving device used for driving the second hinged node directly or indirectly adjusts the angle of the rear connecting rod.

2. The foldable zero-pressure seat of claim 1, wherein, The first hinged node is a hinged node between the seat cushion mounting bracket and the lower front connecting rod, a hinged node between the lower front connecting rod and the upper front connecting rod, or a hinged node between the seat cushion frame assembly and the upper front connecting rod.

3. The foldable zero-pressure seat of claim 1, wherein, The second hinged node is a hinged node between the seat cushion mounting bracket and the rear connecting rod or a hinged node between the seat cushion frame assembly and the rear connecting rod. The angle driving device used for driving the first hinged node comprises one of the following:

4. The foldable zero-pressure seat of claim 1, wherein, a1) an angle adjuster arranged at the first hinged node; a2) a stepped bolt arranged at the first hinged node and a direct-connection motor driving the stepped bolt to rotate, the stepped bolt and the direct-connection motor are respectively fixed relative to two opposite rotatable mechanisms hingedly connected with two sides of the first hinged node; a3) a rack and pinion motor, one of the two opposite rotatable mechanisms hingedly connected with two sides of the first hinged node is provided with a rack hinged node hingedly connected with one end of the rack and spaced apart from the first hinged node, and the other is fixedly provided with the pinion motor, a pinion on an output shaft of the pinion motor is engaged with teeth on the rack; a4) a push rod motor, one of the two opposite rotatable mechanisms hingedly connected with two sides of the first hinged node is fixedly provided with a fixed end of the push rod motor, and the other is provided with a push rod motor hinged node hingedly connected with a movable end of the push rod motor and spaced apart from the first hinged node. ​ 5. The foldable zero-pressure seat of claim 4, wherein, In the case that the angle driving device for driving the first articulation joint comprises a rack and pinion motor and the first articulation joint is the articulation joint between the seat cushion mounting bracket and the lower front link, the rack articulation joint is arranged on one of the seat cushion mounting bracket and the lower front link and the rack and pinion motor is arranged on the other one of the seat cushion mounting bracket and the lower front link.

6. The foldable zero-pressure seat of claim 1, wherein, The angle driving device for driving the second articulation joint comprises one of: b1) an angle adjuster arranged at the second articulation joint; b2) a stepped bolt arranged at the second articulation joint and a direct connection motor driving the rotation of the stepped bolt, the stepped bolt and the direct connection motor being fixed relative to the two opposite rotatable mechanisms articulated on both sides of the second articulation joint respectively; b3) a rack and pinion motor, one of the two opposite rotatable mechanisms articulated on both sides of the second articulation joint is provided with a rack articulation joint articulated with one end of the rack and spaced apart from the second articulation joint, and the other one is fixedly provided with the rack and pinion motor, the gear on the output shaft of the rack and pinion motor being engaged with the teeth on the rack; b4) a push rod motor, one of the two opposite rotatable mechanisms articulated on both sides of the second articulation joint is fixedly provided with the fixed end of the push rod motor, and the other one is provided with a push rod motor articulation joint articulated with the movable end of the push rod motor and spaced apart from the second articulation joint.

7. The foldable zero-pressure seat of claim 6, wherein, In the case that the angle driving device for driving the second articulation joint comprises a rack and pinion motor and the second articulation joint is the articulation joint between the seat cushion mounting bracket and the rear link, the rack articulation joint is arranged on one of the seat cushion mounting bracket and the rear link and the rack and pinion motor is arranged on the other one of the seat cushion mounting bracket and the rear link.

8. The foldable zero-pressure seat of claim 4 or 6, wherein, For the angle driving device employing an angle adjuster, it further comprises a synchronization rod inserted into the shaft center of the angle adjuster and an angle adjuster motor, the driving shaft of the angle adjuster motor being used to drive the rotation of the corresponding synchronization rod, thereby driving the rotation of the shaft center of the angle adjuster.

9. The foldable zero-pressure seat of claim 4, wherein, For the angle driving device for driving the first articulation joint and employing a push rod motor, the push rod motor articulation joint is located below the corresponding first articulation joint, or the push rod motor articulation joint is articulated with the push rod motor through a segment of articulation rod, so that the main shaft of the push rod motor is located below the corresponding first articulation joint of the push rod motor articulation joint; thereby, the seat cushion frame assembly is lifted by the pushing of the push rod motor; or, the push rod motor articulation joint is located above the corresponding first articulation joint, or the push rod motor articulation joint is articulated with the push rod motor through a segment of articulation rod, so that the main shaft of the push rod motor is located above the corresponding first articulation joint of the push rod motor articulation joint; thereby, the seat cushion frame assembly is lowered by the pushing of the push rod motor.

10. The foldable zero-pressure seat of claim 6, wherein, For the angle driving device for driving the second articulation joint and employing a push rod motor, the push rod motor articulation joint is located below the corresponding second articulation joint, or the push rod motor articulation joint is articulated with the push rod motor through a segment of articulation rod, so that the main shaft of the push rod motor is located below the corresponding second articulation joint of the push rod motor articulation joint; thereby, the seat cushion frame assembly is lifted by the pushing of the push rod motor; Alternatively, the push rod motor hinge point is located above its corresponding second hinge node, or the push rod motor hinge point is connected to the push rod motor hinge through a hinge rod, so that the spindle of the push rod motor is located above the second hinge node corresponding to the push rod motor hinge point; thereby, the seat cushion frame assembly is lowered by the driving of the push rod motor.

11. The foldable zero-pressure seat of claim 6, wherein, The seat cushion framework includes two lower front connecting rods arranged on both sides in the transverse direction thereof, and when the two opposite rotatable mechanisms hinged on both sides of the first hinge node are the seat cushion mounting bracket and the lower front connecting rod respectively, a first lower front connecting rod cross pipe is connected between the two lower front connecting rods, the first lower front connecting rod cross pipe is arranged at the push rod motor hinge point and is provided with a push rod motor bracket connected to the movable end of the push rod motor, so as to realize the hinge connection of the push rod motor and the lower front connecting rod at the push rod motor hinge point through the first lower front connecting rod cross pipe.

12. The foldable zero-pressure seat of claim 1, wherein, During switching from the normal posture to the zero-pressure posture, the angle driving device drives the rear connecting rod to rotate relative to the seat cushion mounting bracket, so that the rear end of the seat cushion frame assembly moves forward and upward relative to the lower end of the adjustable backrest framework.

13. The foldable zero-pressure seat of claim 1, wherein, During switching from the normal posture and the zero-pressure posture to the folding posture, the angle driving device drives the rear connecting rod to rotate relative to the seat cushion mounting bracket, so that the rear end of the seat cushion frame assembly moves forward and downward relative to the lower end of the adjustable backrest framework.

14. The foldable zero-pressure seat according to claim 1, wherein, In the normal posture, the adjustable backrest framework is at a first backrest angle of backward inclination; in the zero-pressure posture, the adjustable backrest framework is at a second backrest angle of backward inclination and the inclination angle is greater than the first backrest angle; in the folding posture, the adjustable backrest framework is at a third backrest angle of forward inclination.

15. The foldable zero-pressure seat of claim 1, wherein, The seat includes a support structure, and the seat cushion mounting bracket is fixed on the support structure, and the adjustable backrest framework is hinged to the support structure at the lower end thereof.

16. The foldable zero-pressure seat of claim 1, wherein, Further comprising a safety belt, and the lower fixed point and the buckle mounting point of the safety belt are located on both sides of the seat cushion mounting bracket; and the upper fixed point of the safety belt is located on the side surface of the adjustable backrest framework.

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